6 to 8 hrs for digestion. it stays in the stomach for 2 hours and then in the intestine for another 2 hours. the undigested food goes to the large intestine and the digested food goes to whole body through blood. Carbhydrates and proteins about 1 1/2 -2 hrs. Fats 2 hrs.
And based on that a foetus does not posses self-awareness. Human babies have been found to become self aware between the ages of 18-24 months. The rouge test is a self-recognition test that identifies a human child's ability to recognize a reflection in a mirror as his or her own.
Self-awareness may also be called 'metacognition', which refers to a person's ability to be aware of his or her own cognitive functions, or 'knowing about knowing'. Metacognitive functions include the ability to self-monitor and self-correct behaviour, and are among the highest cognitive functions.his is reflected in the definition of self-awareness as the capacity to perceive the self in relatively objective terms whilst maintaining a sense of subjectivity (Prigatano and Schacter 1991, 13).